Process for the manufacture of rings and especially of wheel tires



Ma 1, 1934. 5. Km 1,956,618

PROCESS FOR THE MANUFACTURE OF RINGS AND ESPECIALLY 0F WHEEL- TIRESFiled July 16, 1928 '2 Sheets-Sheet 1 //7uen for Euye K0 ,0 by 5 Ma 31934 E. KAMP 3,956,618

PROCESS FOR THE MANUFACTURE OF RINGS AND ESPECIALLY 0F WHEEL TIRES FiledJuly 16, 1928 4 2 Sheets-Sheet 2 //7 u en far.

E aye Kamp by A/ror'ne Patented May l, 1934 TENT OFFICE Eugen Kamp,Dortmund, Germany, assignor to the firm Vereinigte StahlwerkeAktiengescllschaft, Dusseldorf Application July 16, 1928, Serial No.293,118 in Germany August 26, 1927 4 Claims.

The invention relates to a process for the manufacture of rings andespecially of wheel tires.

As is well known, the processes hitherto known generally require afterjumping and perforating 5 of the blank or block of raw material, anoperation for bringing the flattened blank to true circular shape undera special press or forging hammer, or by a cogging of the ring on ashaping groove, before it can be rolled to correct dimensions on afinishing groove.

According to the invention it is possible to eliminate this expensive,complicated and output diminishing intermediate operation by first ofall pressing the blank to a fiat disc, the blank lying,

after the flattening, in a closed matrix. Thereafter a cylindricalplunger is forced into the flattened blank, thus causing the material tobe compressed within the matrix. Thereupon the bottom centre piece,which is formed by the penetration of the plunger, is punched out inknown manner but without opening the matrix. This operation can besimplified and cheapened by employing a multiple plunger press. There isthen no necessity to clamp or screw the halves of the die together whenthe plunger penetrates into the flattened material. The ring produced,may be perforated or punched in such a manner that it has the correctdiameter for the pressure head of the finishing mill and is of anexactly round and truly centered shape, thus protecting the rolls to aconsiderable degree.

Figures 1 and 2 of the accompanying drawings show an embodiment of theinvention employing a press with two opposite plungers while Fig. 3

shows in plan view the wheel rim obtained.

The block of raw material or blank 11 which rests on the lower plungerb, movable in the table 0, is pressed down by the simultaneous downwardmotion of the upper half of the die,

together with the matrix d and the upper plunger .9; this downwardmotion continues until the matrix d touches the table 0 thus closing thematrix. During this operation the plunger e can be either flush with thebottom of the die or it may project somewhat as shown in Figure 1. Thematrix now being in a closed position, the plunger e is caused topenetrate so far into the material, that a recess is formed, leaving abottom centre piece f, the matrix being now completely filled withcompressed material. This operation can be seen from Figure 2. Theplunger 6 is now drawn back and the bottom centre-piece I is punched outby means of the antagonistic plunger b, which is pressed upwards by thepusher 9. After the matrix (1 has been lifted, the piece so produced isconveyed to the finishing mill, where it is rolled to the finished statein the same heat. If no lower plunger is available, then the operationmay be carried out in such a manner that the lower plunger b is laid ona sliding piece that is withdrawn when the plunger e is actuated for thepunching out of the bottom centre piece I.

By means of the new process, the important advantage is realized bothfrom a technical and an economical point of view, that, presuming tiresor rings of the same type are to be produced, the weights and dimensionsof the several tires or rings are all absolutely identical, a featurewhich was up till now unattainable. f.

The essential features of the invention are not" affected if the ringsor tires are used straight away as they are turned out by the press.

What I claim and desire to secure by Letters Patent of the United Statesis:

1. Method for manufacturing rings, particularly wheel rims by means of adie with a matrix, in a single operation, which consists in compressinga block of the raw material between the open halves of the die so as toexpand the material laterally and form a fiat wheel disc, the matrixbeing simultaneously closed, then applying pressure to the centralportion of the said wheel disc so that the material is forced into theclosed matrix thereby filling out the same, and finally punching out thesaid central portion from the wheel disc.

2. Method for'manufacturing rings, particularly wheel rims by means of adie with a matrix in a single operation, which consists in compressing ablock of the raw material between the open halves of the die so as toexpand the material laterally and form a flat wheel disc, the matrixbeing simultaneously closed,'then applying pressure to the centralportion of the said wheel disc, in order to form a depression and awaste center piece so that the material is forced into the closed matrixand against its walls, and finally punching out the said waste centerpiece.

3. Method for manufacturing rings, particularly wheel rims by means of adie with a matrix, in a single operation, which in a combined sequenceof steps consists in compressing a block of the raw material between theopen halves of the die so as to expand the material laterally and form aflat wheel disc, the matrix being simultaneously closed, then applyingpressure in the same direction as the pressure was applied when closingthe matrix in order to form a depression in the central portion of thedisc and a waste center 1 piece so that the material is lorced into theclosed matrix and against its walls and thereby fills out said matrix,and finally applying pressure to the waste center piece in an oppositedirection so as to punch out the said piece from the wheel disc.

4. A method for manufacturing rings by means of a die with a dividedmatrix, and particularly Wheel rims of precise dimensions from blankssubject to tolerances of weight, which consists in initially compressinga cylindrical blank between the open halves of the die by means of apres sure acting simultaneously and uniformly with continuous efiectupon the whole cross section of the blank so as to transform said blankinto a Learners illatdisc 'untllthe halves of the die meet and form aclosed die enclosing a die chamber of constant size, thereafter applyingpressure upon the central portion of the blank or flat disc which doesnot wholly fill the die, until said disc completely fills out said dieand thus compensating the tolerance in the original weight of the blankby means 01 a more or less deep penetration into said blank on the partof the die member acting upon the central portion of the blank, andfinally punching out said central portion containing the whole of saidtolerance of the original weight of the bl.

EUGEN RAW.

